Yalden, Jenice
Cambridge University Press, 1987
Buku Teks
Richards, Jack C., author
Cambridge University Press, 2017
Buku Teks
edited by Robert Keith Johnson
Cambridge University Press, 1994
Buku Teks
Dubin, Fraida, author
Cambridge University Press, 1986
Buku Teks
Ur, Penny, author
Cambridge University Press, 1991
Buku Teks